Webster's English Dictionary

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imperturbable

Cross references:
  1. cool                  
 
im.per.turb.able \.im-p*r-'t*r-b*-b*l\ \-ble-\ aj [ME, fr. LL 
   imperturbabilis, fr. L in- + perturbare to pertur]b : marked by extreme 
   calm, impassivity, and steadiness : SERENE  - im.per.turb.ably av